Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e208471ecf3a5e…

MALICIOUS

PDF

76.1 KB Created: 2021-03-23 15:10:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 900556fa662f15804cc205628fd0e5ab SHA-1: b260a76c5a484fb6be5089c60affbc296a6b8e27 SHA-256: 27e208471ecf3a5efb0c0c9985dbbc8ac7c6159dd3326a8a960f26a5c5b92325
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to lead users to malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and an ML classifier also flagged it with high confidence. The primary malicious URL identified is https://baarspo.ru/strik?utm_term=anatomy+of+breastfeeding+pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/strik?utm_term=anatomy+of+breastfeeding+pdf PDF link annotation
    • http://lnstagramverifiedbadgeshelpcenters.net/96238643537n73lx.pdfIn PDF document text
    • http://bluhgang.best/43796994108e1lmn.pdfIn PDF document text
    • http://gaydating.world/87794335897ieiby.pdfIn PDF document text
    • http://kizunawinim.getenjoyment.net/z_for_zachariah_film_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/dAYgcji/87848217781.pdfIn PDF document text
    • http://vexetifiridik.mypressonline.com/lozigosowurege.pdfIn PDF document text
    • https://cdn.sqhk.co/gajeneset/phh3Lhd/gmail_sign_in_gmail_help.pdfIn PDF document text
    • https://cdn.sqhk.co/nufuwijili/jbiggfe/68084866143.pdfIn PDF document text
    • http://gukevipagopu.mywebcommunity.org/chemistry_experiments_for_life_science_majors_4th_edition_free.pdfIn PDF document text
    • https://cdn.sqhk.co/puburikob/ighhidQ/ashes_cricket_2009_for_laptop.pdfIn PDF document text
    • https://cdn.sqhk.co/nodomepe/Fiagd2l/22775659059.pdfIn PDF document text
    • http://24goodstore.site/learn_english_through_story_level_2_subtitlesyjeng.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/mozopadax.pdfIn PDF document text
    • https://cdn.sqhk.co/rukugewul/gfhaCcS/dinuruxomonoputegab.pdfIn PDF document text
    • https://cdn.sqhk.co/jekidase/igjhhdl/earn_to_die_3_tyrone_s_unblocked_games.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/1Cnfxvw/k12_texas_reviews.pdfIn PDF document text
    • http://ilook.market/clock_templateoacsl.pdfIn PDF document text
    • https://cdn.sqhk.co/rarinuva/hb3jbgj/jibjab_free_gif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_00e561e92ffb4df9a354abc9df35a51c.pdf?index=trueIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_a13539ca71a24bb4ba85961715faefb9.pdf?index=trueIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_3c7bd3420fc54360b5bd25533a0ad530.pdf?index=trueIn PDF document text
    • http://sajetowariwi.rf.gd/14095026387.pdfIn PDF document text
    • http://ribowofipap.rf.gd/abasa_surah.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 5560 bytes
SHA-256: 1c14ceb483ca874b95dbae8dc9d099daa27c64da009f3a5e94e1c3b503d3a3fe
font_01_sfnt_off0000fcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC5 11352 bytes
SHA-256: 1b73ba6687fb82f63c902459bf23b2e8dbc8e22d7cf7a55b9ea17a543a3181f8

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